Multiple Fano-Like MIM Plasmonic Structure Based on Triangular Resonator for Refractive Index Sensing

Janković, Nikolina

doi:10.3390/s18010287

Cited by 63 publications

(17 citation statements)

References 43 publications

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“…Then the group refractive index and group velocity were calculated by the formula (9) where n g is the group refractive index, v g is the group velocity, c represents the speed of light in free space and D is the distance between the input port and the output port. Figure 9c shows the dependence between the group refractive index and the incident wavelength.…”

Section: Resultsmentioning

confidence: 99%

“…Due to the interference of continuous (bright) modes and discrete (dark) modes, the Fano resonance exhibits a sharp asymmetric line shape characteristic [7], which has attracted more and more attention. The common design methods of these structures can be generally divided into three categories -First is that the input and output waveguides are direct coupled to both ends of the resonator [3,[8][9][10], second is that the resonators are side-coupled to one waveguide between the input and output ports [11][12][13][14][15], and third is that the input waveguide, output waveguide and resonators are all coupled through a gap [2,16,17]. The common resonators are rectangular [6], ring [14], triangular [9], disk [18,19], hexagonal [20] and other special shapes.…”

Section: Introductionmentioning

confidence: 99%

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Plasmonic nanosensor based on multiple independently tunable Fano resonances

Cheng¹,

Wang²,

He³

et al. 2019

Beilstein J. Nanotechnol.

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A novel refractive index nanosensor with compound structures is proposed in this paper. It consists of three different kinds of resonators and two stubs which are side-coupled to a metal–dielectric–metal (MDM) waveguide. By utilizing numerical investigation with the finite element method (FEM), the simulation results show that the transmission spectrum of the nanosensor has as many as five sharp Fano resonance peaks. Due to their different resonance mechanisms, each resonance peak can be independently tuned by adjusting the corresponding parameters of the structure. In addition, the sensitivity of the nanosensor is found to be up to 1900 nm/RIU. For practical application, a legitimate combination of various different components, such as T-shaped, ring, and split-ring cavities, has been proposed which dramatically reduces the nanosensor dimensions without sacrificing performance. These design concepts pave the way for the construction of compact on-chip plasmonic structures, which can be widely applied to nanosensors, optical splitters, filters, optical switches, nonlinear photonic and slow-light devices.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Plasmonic nanosensor based on multiple independently tunable Fano resonances

Cheng¹,

Wang²,

He³

et al. 2019

Beilstein J. Nanotechnol.

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“…The blue and white areas denote the noble metal of silver and air, respectively. For silver, its frequency-dependent complex relative permittivity is characterized by the Drude model [ 30 , 31 ]:

where ε ∞ is the dielectric constant at infinite frequency, γ is the electron collision frequency, ω is the frequency of the incident light, and ω p is the bulk plasma frequency. The parameters are ε ∞ = 3.7, ω p = 1.38 × 10 16 Hz, and γ = 2.73 × 10 13 Hz.…”

Section: Structure Designmentioning

confidence: 99%

Independently Tunable Fano Resonances Based on the Coupled Hetero-Cavities in a Plasmonic MIM System

et al. 2018

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In this paper, based on coupled hetero-cavities, multiple Fano resonances are produced and tuned in a plasmonic metal-insulator-metal (MIM) system. The structure comprises a rectangular cavity, a side-coupled waveguide, and an upper-coupled circular cavity with a metal-strip core, used to modulate Fano resonances. Three Fano resonances can be realized, which originate from interference of the cavity modes between the rectangular cavity and the metal-strip-core circular cavity. Due to the different cavity-cavity coupling mechanisms, the three Fano resonances can be divided into two groups, and each group of Fano resonances can be well tuned independently by changing the different cavity parameters, which can allow great flexibility to control multiple Fano resonances in practice. Furthermore, through carefully adjusting the direction angle of the metal-strip core in the circular cavity, the position and lineshape of the Fano resonances can be easily tuned. Notably, reversal asymmetry takes place for one of the Fano resonances. The influence of the direction angle on the figure of merit (FOM) value is also investigated. A maximum FOM of 3436 is obtained. The proposed structure has high transmission, sharp Fano lineshape, and high sensitivity to change in the background refractive index. This research provides effective guidance to tune multiple Fano resonances, which has important applications in nanosensors, filters, modulators, and other related plasmonic devices.

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“…Surface plasmon polaritons (SPPs) can use as electromagnetic (EM) wave transportation and confine EM wave at the dielectric–metal interface because of their capacities of handling light in the nanoscale [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. A standard dielectric (or insulator) waveguide cannot form the EM wave beyond conventional optics’ diffraction limit [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Ultrawide Bandgap and High Sensitivity of a Plasmonic Metal-Insulator-Metal Waveguide Filter with Cavity and Baffles

et al. 2020

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A plasmonic metal-insulator-metal waveguide filter consisting of one rectangular cavity and three silver baffles is numerically investigated using the finite element method and theoretically described by the cavity resonance mode theory. The proposed structure shows a simple shape with a small number of structural parameters that can function as a plasmonic sensor with a filter property, high sensitivity and figure of merit, and wide bandgap. Simulation results demonstrate that a cavity with three silver baffles could significantly affect the resonance condition and remarkably enhance the sensor performance compared to its counterpart without baffles. The calculated sensitivity (S) and figure of merit (FOM) in the first mode can reach 3300.00 nm/RIU and 170.00 RIU−1. Besides, S and FOM values can simultaneously get above 2000.00 nm/RIU and 110.00 RIU−1 in the first and second modes by varying a broad range of the structural parameters, which are not attainable in the reported literature. The proposed structure can realize multiple modes operating in a wide wavelength range, which may have potential applications in the on-chip plasmonic sensor, filter, and other optical integrated circuits.

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Multiple Fano-Like MIM Plasmonic Structure Based on Triangular Resonator for Refractive Index Sensing

Cited by 63 publications

References 43 publications

Plasmonic nanosensor based on multiple independently tunable Fano resonances

Plasmonic nanosensor based on multiple independently tunable Fano resonances

Independently Tunable Fano Resonances Based on the Coupled Hetero-Cavities in a Plasmonic MIM System

Ultrawide Bandgap and High Sensitivity of a Plasmonic Metal-Insulator-Metal Waveguide Filter with Cavity and Baffles

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